Like, if my life was on the line, and my lawyer was screwing up my evidence, I think I'd try to point that out to someone.
A vast majority of defendants don't know all the ins and outs of law... that's why we have a profession to deal in this domain. Asking the average defendant to check their counsel's work is ridiculous.
To give an example that might resonate to HN folks, suppose your attorney says "I know my client had a bunch of hacking tools on his computer, and that looks bad". Now suppose the laptop in question is your work-issues computer, and you work in pen testing, so you possess all of those for legitimate work-related reasons. I think it'd be hard to appeal on those grounds. "My attorney should have said something?" "You just sat there and went along with it, though." Appeals aren't meant to be an infinite series of do-overs were you get to relitigate every single thing you wish you'd said differently.
If your attorney messes up on legal issues, that's on them. When they mess up on the basic facts, and you don't say anything about it, I think that's kind of on you.
Your proposal is that the client has to have enough of a grasp on the legal strategy related to self-incrimination that they could challenge and disregard their attorneys advice, in order to save themselves from something the attorney misinterpreted.
I personally think that's way too much to ask of a defendant. You even see the accused who are lawyers themselves just hire other lawyers and promptly stfu. Counsel always decides and implements the strategy.
However, failing to properly object to how some emojis were entered into evidence is no where near the standard of being ineffective.